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Table 3 Rates of false positives or negatives of BMI- and WHR-defined obesity based on the criteria of BFP

From: Body mass index and waist-to-hip ratio misclassification of overweight and obesity in Chinese military personnel

Obesity
status
BFP standarda P value   Obesity
status
BFP standarda P value  
Overweight/obese
(BFP ≥ 22%)
Non-overweight/non-obese
(BFP < 22%)
Rates of false positive or negative Overweight/obese (BFP ≥ 22%) Non-overweight/non-obese
(BFP < 22%)
Rates of false positive or negative
Military personnel
Overweight/obese
(BMI ≥ 24 kg/m2)
14 65 < 0.01 False positive 19.2% (65/339) Obese (WHR ≥ 0.91) 13 47 < 0.01 False positive
13.9% (47/339)
Non-overweight/non-obese (BMI < 24 (kg/m2) 0 274 False negative 0% (0/14) Non-obese (WHR < 0.91) 1 292 False negative 7.1% (1/14)
Age-matched control group
Overweight/obese
(BMI ≥ 24 (kg/m2)
22 18 0.076 False positive 5.1% (18/350) Obese (WHR ≥ 0.91) 26 19 < 0.01 False positive 5.4% (19/350)
Non-overweight/non-obese (BMI < 24 (kg/m2) 8 332 False negative 26.7% (8/30) Non-obese (WHR < 0.91) 4 331 False negative 13.3% (4/30)
  1. Note: BMI body mass index, BFP body fat percentage, WHR waist-to-hip ratio
  2. aFor each analysis, BFP served as standard and BMI or WHR-based categories as “screening tests”
  3. False-positive and false-negative rates were calculated using following equations: False positive rate = BMI or WHRoverweight/obese BFPnonoverweight/nonobese/BFP nonoverweight/nonobese. False negative rate = BMI or WHRnonoverweight/non obese BFPoverweight/obese/BFPoverweight/obese. The numbers in the parenthesis were represented according to the formulas of calculating false positive/negative rates above